Washington County's 2026 population is estimated at 139,189, reflecting a 0.17% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Washington County is the 11th largest county in Wisconsin. The 2010 population was 131,990 and has grown 5.45% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.8 years
Female: 44.6 years
Male: 43.2 years
There are 108,954 adults, (27,367 of whom are seniors) in Washington County.
Female: 69,013 (50.1%)
Male: 68,866 (49.9%)
The racial composition of Washington County includes 91.41% White, and smaller percentages for Asian, Black or African American, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 126,038 | 91.41% |
| Two or more races | 6,475 | 4.7% |
| Asian | 2,019 | 1.46% |
| Black or African American | 1,836 | 1.33% |
| Other race | 1,301 | 0.94% |
| Native American | 188 | 0.14% |
| Native Hawaiian or Pacific Islander | 22 | 0.02% |
Washington County 's average per capita income is $61,392. Household income levels show a median of $96,359. The poverty rate stands at 5.79%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $126,682 | $146,485 |
| Families | $114,977 | $137,147 |
| Households | $96,359 | $116,246 |
| Non Families | $52,809 | $66,133 |
Average Income
Median Household Income
Poverty Rate
